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LONG TERM DEBT AND CAPITAL LEASES - Credit Facility (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Secured Debt | Term Facility due 2023 (Term Loan A Facility) [Member] | Line of Credit  
Line of Credit Facility [Line Items]  
Aggregate principal amount issued $ 350,000,000
Secured Debt | Term Loan B Facility  
Line of Credit Facility [Line Items]  
Aggregate principal amount issued $ 350,000,000
Facility term 5 years
Net leverage ratio 2.25
Secured Debt | Term Loan B Facility | LIBOR  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (as a percent) 1.25%
Basis spread on variable rate 2.50%
Secured Debt | Term Loan B Facility | LIBOR | Maximum  
Line of Credit Facility [Line Items]  
Basis spread on variable rate (as a percent) 2.00%
Revolving Credit Facility | Revolving Credit Facility Due 2023 [Member] | Line of Credit  
Line of Credit Facility [Line Items]  
Credit facility maximum $ 200,000,000
Line of Credit | Refinanced Revolving Credit Facility due October 2021; bore interest at LIBOR plus 2.75% | Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Credit facility maximum 160,000,000
Remaining capacity 107,879,000
Line of Credit | Refinanced Revolving Credit Facility due October 2021; bore interest at LIBOR plus 2.75% | Letter of Credit  
Line of Credit Facility [Line Items]  
Outstanding irrevocable letters of credit totaling 22,521,000
Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Additional revolver capacity $ 125,000,000